<!DOCTYPE html> 
<html> 
<body> 
<div id="Container" style="width:300px; height:200px; border:1px solid red;">
	<div id="DIV1" style="float:right; width:150px; height: 50px; background-color:darkgray;">1 float:right;</div>
	<div id="DIV2" style="clear:right; float:right; width:250px; height: 50px; background-color:silver;">2 clear:right; float:right;</div>
	<div id="DIV3" style="float:left; width:100px; height: 50px; background-color:gray;">3 float:left;</div>
</div>

</body> 
</html>